feat(general): add defaultNodes, defaultEdges and defaultEdgeOptions

example/src/DefaultNodes/index.tsx

@@ -0,0 +1,98 @@
+import { useState } from 'react';
+import ReactFlow, {
+  Background,
+  BackgroundVariant,
+  Node,
+  Edge,
+  ReactFlowInstance,
+  ReactFlowProvider,
+  useUpdateNodes,
+  useUpdateEdges,
+} from 'react-flow-renderer';
+
+const defaultNodes: Node[] = [
+  { id: '1', type: 'input', data: { label: 'Node 1' }, position: { x: 250, y: 5 }, className: 'light' },
+  { id: '2', data: { label: 'Node 2' }, position: { x: 100, y: 100 }, className: 'light' },
+  { id: '3', data: { label: 'Node 3' }, position: { x: 400, y: 100 }, className: 'light' },
+  { id: '4', data: { label: 'Node 4' }, position: { x: 400, y: 200 }, className: 'light' },
+];
+
+const defaultEdges: Edge[] = [
+  { id: 'e1-2', source: '1', target: '2' },
+  { id: 'e1-3', source: '1', target: '3' },
+];
+
+const defaultEdgeOptions = {
+  animated: true,
+};
+
+const DefaultNodes = () => {
+  const [rfInstance, setRfInstance] = useState<ReactFlowInstance | null>(null);
+  const updateNodes = useUpdateNodes();
+  const updateEdges = useUpdateEdges();
+
+  const logToObject = () => console.log(rfInstance?.toObject());
+  const resetTransform = () => rfInstance?.setTransform({ x: 0, y: 0, zoom: 1 });
+
+  const updateNodePositions = () => {
+    updateNodes((nodes, setNodes) => {
+      setNodes(
+        nodes.map((node) => {
+          node.position = {
+            x: Math.random() * 400,
+            y: Math.random() * 400,
+          };
+
+          return node;
+        })
+      );
+    });
+  };
+
+  const updateEdgeColors = () => {
+    updateEdges((edges, setEdges) => {
+      setEdges(
+        edges.map((edge) => {
+          edge.style = {
+            stroke: '#ff5050',
+          };
+
+          return edge;
+        })
+      );
+    });
+  };
+
+  return (
+    <ReactFlow
+      defaultNodes={defaultNodes}
+      defaultEdges={defaultEdges}
+      defaultEdgeOptions={defaultEdgeOptions}
+      onPaneReady={setRfInstance}
+      fitViewOnInit
+    >
+      <Background variant={BackgroundVariant.Lines} />
+
+      <div style={{ position: 'absolute', right: 10, top: 10, zIndex: 4 }}>
+        <button onClick={resetTransform} style={{ marginRight: 5 }}>
+          reset transform
+        </button>
+        <button onClick={updateNodePositions} style={{ marginRight: 5 }}>
+          change pos
+        </button>
+        <button onClick={updateEdgeColors} style={{ marginRight: 5 }}>
+          red edges
+        </button>
+        <button onClick={logToObject}>toObject</button>
+      </div>
+    </ReactFlow>
+  );
+};
+
+export default function App() {
+  return (
+    <ReactFlowProvider>
+      <DefaultNodes />
+    </ReactFlowProvider>
+  );
+}

example/src/index.tsx

@@ -31,6 +31,7 @@ import NodeTypesObjectChange from './NodeTypesObjectChange';
 import SaveRestore from './SaveRestore';
 import SwitchFlow from './Switch';
 import Validation from './Validation';
+import DefaultNodes from './DefaultNodes';
 
 import './index.css';
 
@@ -43,6 +44,10 @@ const routes = [
     path: '/basic',
     component: Basic,
   },
+  {
+    path: '/default-nodes',
+    component: DefaultNodes,
+  },
   {
     path: '/custom-connectionline',
     component: CustomConnectionLine,